问题：使用docker 利用下载的ubuntu镜像启动容器时，使用的源下载更新软件的速度较慢。
解决这个问题的方法是跟新ubuntu容器的源
示例：以ubuntu为基础镜像
1）启动一个名称为 test02的容器，并且开启shell交互（/bin/bash ）
# docker run -ti --name test02 ubuntu /bin/bash
2）用自带vi修改源
root@e330db11c513:/# vi /etc/apt/sources.list
将原有内容删除，并替换为以下的阿里源
deb http://mirrors.aliyun.com/ubuntu/ trusty main multiverse restricted universe
deb http://mirrors.aliyun.com/ubuntu/ trusty-backports main multiverse restricted universe
deb http://mirrors.aliyun.com/ubuntu/ trusty-proposed main multiverse restricted universe
deb http://mirrors.aliyun.com/ubuntu/ trusty-security main multiverse restricted universe
deb http://mirrors.aliyun.com/ubuntu/ trusty-updates main multiverse restricted universe
deb-src http://mirrors.aliyun.com/ubuntu/ trusty main multiverse restricted universe
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-backports main multiverse restricted universe
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-proposed main multiverse restricted universe
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-security main multiverse restricted universe
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-updates main multiverse restricted universe
3）更新源
sudo apt-get clean
sudo apt-get update
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